Printing-press



(No Model.) 4 Sheets Sheet 1.

' J. F. W. DORMAN.

PRINTING PRESS.

Patented Nov. 22,1887

N, PETERS. PhnlwLilMgnphor, Washinglon, D. c.

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(No Model.) 4 Sheets-Sheet 2.

J. P. W. DORMAN.

- PRINTING PRESS.

No. 373,649. Patented Nov. 22, 1887.

(No Model.) 4 Sheets-Sheet 3.

J. F. W. DORMAN. PRINTING PRESS.

No. 373,649. Patented Nov. 22, 1887.

I INVENT CIR- (No M odel.) 4Sheets-Sheet 4.

J, F. W. D ORMAN.

I PRINTING, PRESS. No. 373,649. Patented NOV. 22,.18'87.

N. PETERS. Ph0|0-Li|hngmphen washin lun. 17,0.

JOHN F. \V. DORMAN, OF BALTIMORE, MARYLAND.

PRINTING-PRESS.

SPECIFICATION forming pali; of Letters Patent NO. 373,649, dated November 22, 1887.

Application filed August 13, 1886. Serial No. 210,760. (No model.)

To all whom it may concern.-

Be it known that I, JOHN F. IV. DORMAN, of the city of Baltimore, and State of Maryland, have invented certain Improvements in Printing-Presses, of which the following is a specification.

The first part of the said invention relates to improved means for holding the platen and rocker firmly in place while the impression is being made, in order to counteract the tendency of the platen to tilt when the type or form is placed either above or below the center of the bed.

The second part of the said invention relates to the combination of the inking-rollers, the inking-disk, and an ink-distributing roller, which is adapted to have a vibratory endwise motion as it passes over the inking-disk to break up and evenly distribute the ink thereon.

In the drawings forming a part hereof, Fig are I is an exterior side view of the improved printing-press with certain parts thereof removed. Fig. II is an exterior rear viewof the same. Figs. III to XIV, inclusive, are details of the invention, as hereinafter described.

In the said drawings, A is the frame of the press, and A the driving shaft to which power is applied. The shaft A extends entirely through the frame A, and is provided with a fly-wheel, 13, (shown only in Fig. I,) and adriving-pulley,which is notrepresented in the drawings. The press is also provided with a t-readle and suitable connections,whereby it can be operated by foot-power, if desired.

At the end of the shaft A is a pinion, a, which engages with a large wheel, B, on the shaft a.

O is a shaft from which the inking-rollers receive their motion, and the said shaft derives its movement from the shaft a, through the medium of the pair of gears b and b',which are of common or uniform size and fastened, respectively, to the shafts a and O.

G is the bed of the press, and its face is denoted by c, and D is the platen,which in general construction differs in no essential particulars from those commonly employed in printing-presses.

D is the front shaft or spindle extending through the body of the rocker Dand adapted to be turned therein. The ends of the front shaft or spindle, D, are reduced in size and made eccentric with reference to the center portion thereof. (See particularly Figs.VI and VII.) The eccentric ends ofthe spindle or front shaft are united to the pins 0' c on the gears B and b by means of the draw bars (1 d. \Vhere the draw-bars are united to the pins 0 c, I employ grooved cams and provide the draw-bars, which are slotted, with pins which enter the said grooves to effect a stop in the motion of the platen, as is common.

To throw off the impression it is necessary to turn the front shaft so as to bring its eccentric ends toward the bed of the press, which has the same effect as if the draw-bars were lengthened, as will be readily understood. To obtain this movement of the front shaft I em ploy a handle, 6, (shown in Figs. X, XI, and XII,) the hub of which is secured to the front shaft in any suitable manner. At the rear side of this handle I hinge a lever, 0, having a tooth, f, projecting from one of its sides, adapted to bear on the edge of a collar,f, which is attached immovably to the rocker. (See Fig. XI.) A spring, 9, is fastened to the outside of the hub of the handle 6 and bears on the lever e to keep the tooth j" closely in contact with the, periphery of the collar f and make the same enter the notches g g in the said collar. By means of these simple devices I am enabled to effect the same result as is usually obtained by the combination of a large number of parts, thus cheapening and simplifying the press.

F is a bar which extends across the frame A, to which it is fastened in any suitable manner. The rocker D is furnished with two extensions, h h, which pass under the bar F, and where the said extensions are in contact with the said bar they are fitted with steel plates i, fastened thereto by means of screws 1'.

\Vhen, in the operation of the press, the contact-surfaces of the extensions of the platen and the bar F become worn, the lost movement can be taken up by merely inserting between the steel plates and the extensions h thin pieces of paper, metal, or other substance.

A rod, j, confined between the extensions h h of the rocker D, is united, by means of an extensible bar or connecting-rod, F, to the bar F, which is made cylindrical at that point,

, turn thereon.

so that thebifurcatedends of the said rod may- This extensible rod is in two parts, and l, the former passing within the latter, and is provided with a spring, Z, which is confined between a nut on the end of the sect-ion k and the projecting edge of thesection Z, formed by enlarging the opening therein which holds the spring Z. (See Fig. XIV.)

The object in making the rod F extensible will be hereinafter explained. The rocker D is driven forward and backward by means of the draw-bars d cl, and the lower part of the rocker is united to the fixed bar F by means of the connecting-rod F. Consequently the rocker and platen, in their backward motion, are tilted to admit of the placing on the platen the sheets to be printed. In this tilting motion the platen rocks on the curved wings m, which bear on the frame A. The faces of the extensions h h are notched, in order that the platen when forced up to the bed may fit around the rod G, as shown particularly in Fig. VI.

It will he understood that the position of the rod G is such that it does not interfere with the full approach of the rocker toward the bed of the machine or, in other words, when the rod is in the notch, the rocker is fully up to its place, and while the bottom of the said slot does not bear with any force on' the rod G, the edges of the said slot at the face of the rocker prevent the said rocker from tilting, as will be understood. When the rocker is in this position, itis held firmly by the rod G- and the bar F, and no tilting motion can possibly take place,'as pressure is applied to the platen.

I am aware that various locking devices have been employed to prevent the tilting of the platen when the impression is being made;

but in all of them thereis great liability to wear of the frictional surfaces. In my improved press the locking devices can only wear at the point where the extensions h h of the platen are in contact with the bar F, and this'can be easily compensated for by the insertion of liners between the steel plates and the extensions, as hereinbefore described. It will be seen that there can be no wear or friction where the notched platen passes around the rod G,'as the surfaces of the said parts are merely brought together. In the backward movement of the draw-bars d d the spiral spring Z in the connecting-rod F is compressed and the platen IOGKS, as before described.

H is an inking-disk, which is revolved in the usual manner, and therefore the means for effecting its revolution require no description herein. The said inking-disk is provided with a brake,which consists of a headed stem, it, having at its upper end a wooden plug to bear against the under side of the disk to cause friction, and a spring, 0, to keep the said stem extended. This brake serves to effect a regular tension on the inking-disk, andpreveuts the same being carried. around farther than the distance traveled by the pawl 12.

The inking-rollers are denoted by I, and the arms through which they receive their backward and forward movement by J. The said arms oscillate on the shaft a, and the motion is derived from a crank, K, forming a part of the shaft 0, through the medium of the connecting-rod L.

M is an ink-distributing roller supported by the arms J and sliding stems and springs, in a manner similar to the inking-rollers I." It differs, however, from them in that its rollerwheels are of such size as to prevent the said roller coming in contact with the type, while they permit it to roll on the inking-disk. The

roller-carriers N,which support the distributing-roller, are fitted with helical collars or cams O, and the core or spindle]? of the said roller is furnished with pins q,which bear against the faces of the said cams. from opposite sides of the roller core or spindle. distributingroller, the same receives a reciproeating endwise motion as it passes over the ink-disk, and the ink is evenly distributed.

'Itwill be understood that to make the vibratory ink-distributin g roller thoroughly effective it is necessary that the ink-diskshould have a regular motion, and this is effected by the brake before described. With these two devices combined a result is produced equal in all essential particulars to the more complicated and costly devices now in use.

I am aware that rotative inking-disks have been used in connection with inking-rollers placed in an angular position with reference to a line at a right angle with the general path of the said rollers, the same having a vibratory movement in View of their angular position and the action of the inking-surface; but in this arrangement the ink on the surface of the ink-disk is only carried over in the form of a wave in one direction as the roller passes up, and in a contrary direction as it is reversed or I passes down. With my invention the roller is moved backward and forward in an endwise direction on the rotative inkingdisk as it travels either way, cutting and distributing the ink more effectually than it is possible with the self-vibratory roller above alluded to.

I do not claim, broadly, the combination of a a rotative inking-disk and. a vibratory distributing inking roller; but

What I do claim as my invention is- 1. In a printing-press, the combination of the platen D, having the extensions h, the fixed bar F, and the rod Gr, the said extensions being notched to fit around the said rod, substantially as and for the purpose specified.

2. In a-printing-press, thev combination of a rotating inking-disk and an ink-distribut ing roller adapted to pass over the said disk,

These pins project Consequently, in the revolution of the the same being adapted to make a full or complete endwise vibration at each revolution, substantially as and for the purpose specified.

3. In a printing-press, the combination of 5 a rotating inking-disk, an ink-distributing roller supported by means of its spindle in the inking-roller arms, transverse pins projecting laterally or radially from the said spindle near to its ends and in opposite directions, and

10 helical collars rigidly attached to the faces of the said inking-r0ller arms, and between the said arms and the said radially-situated pins, whereby,in the rotation of the said distributing-roller,the same is made to vibrate endwise on the inking-disk, substantially as and for 15 the purpose specified.

JOHN F. WV. DORMAN. Witnesses:

JNo. T. lVIADDOX, DANL. FISHER. 

